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On elastic-plastic collapse of subsea pipelines under external hydrostatic pressure and denting force |
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| Affiliation: | 1. Griffith School of Engineering, Griffith University, Gold Coast Campus, QLD 4222, Australia;2. School of Engineering, Central Queensland University, QLD 4740, Australia;1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, 116024, China;2. School of Hydraulic Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian, 116024, China;3. National Engineering Laboratory for Pipeline Safety, Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, China University of Petroleum, Beijing, 102246, China;1. Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;2. Department of Mechanical Engineering, Faculty of Engineering, Universiti Teknologi Petronas, 31750 Tronoh, Perak, Malaysia;1. Griffith School of Engineering and Built Environment, Griffith University, Gold Coast Campus, QLD 4222, Australia;2. School of Engineering and Technology, Central Queensland University, QLD 4740, Australia |
| Abstract: | This paper presents analytical and numerical researches on the buckling or collapse of offshore pipelines under external hydrostatic pressure. Firstly the case of homogeneous ring model is investigated followed by a detailed study on corroded rings. The elastic-plastic collapse pressure could be treated as the least root of an elementary function. We prove that collapse pressure is a strictly increasing function of mode number in this paper and present some interesting structures of the roots. Partially corroded ring is parametrized by corrosion depth and angle extent. A comprehensive comparison shows that plasticity should not be neglected when the ring is thick-walled. Moreover, a study on large deflection deformation of 3D cylindrical shells quasi-statically dented under constant external pressure is carried out theoretically and numerically. The buckle propagation pressure is shown to be a meaningful value to normalize external pressure. This paper serves to enhance the understanding of destabilizing effect of external pressure mainly applicable and relevant to subsea offshore industry. |
| Keywords: | Buckling Hydrostatic pressure Subsea pipelines Ring Cylindrical shell |
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